/Engine/Source/Runtime/Engine/Classes/Animation/AnimData/IAnimationDataController.h
Opens an interaction bracket, used for combining a set of controller actions. Broadcasts a EAnimDataModelNotifyType::BracketOpened notify, this can be used by any Views or dependent systems to halt any unnecessary or invalid operations until the (last) bracket is closed.
void OpenBracket ( const [FText](API\Runtime\Core\Internationalization\FText) & InTitle, bool bShouldTransact )